Abstract: In1990s, the dams of hydropower stations have made great flood control benefit during several extreme floods. Meanwhile, abnormal phenomenon occurring many times of less reservoir inflow but high water level over dam imperiled dam and downstream hugely. Therefore, concept of flood control should be changed from controlling to managing, founding a set of system of flood control and disaster reduction with the whole people participating in, making scientific decision reasonably to avoid the risk of small flood but high water level and prevent overflow and dam failure event for ensuring national economy in sustainable development.

摘要： 20世纪90年代的几场大洪水，水电站大坝发挥出了巨大的防洪效益。而同时也多次发生入库洪水较小，坝上水位反而很高的反常现象，给大坝及下游带来巨大风险。因此，防洪观念应从控制洪水向洪水管理转变．努力建设全民肪洪减灾体系，把握适度科学决策，以规避“小洪水高水位”风险，防止产生洪水漫坝或溃坝事故，保障国民经济可持续发展。